WHAT: WBO Heavyweight World Champion Joseph Parker will host a U.S. media conference call as he prepares to face IBF and WBA World Champion Anthony Joshua in a heavyweight world title unification Saturday, March 31 live on SHOWTIME (5 p.m. ET/2 p.m. PT) from Principality Stadium in Cardiff, Wales.

Joshua (20-0, 20 KOs) vs. Parker (24-0, 18 KOs) is just the second heavyweight championship unification in history between undefeated world titleholders.